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Date: Mon, 12 Apr 2010 11:47:40 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: Re: hugepages will matter more in the future
References: <20100411110015.GA10149@elte.hu> <4BC1B034.4050302@redhat.com> <20100411115229.GB10952@elte.hu> <alpine.LFD.2.00.1004110814080.3576@i5.linux-foundation.org> <4BC1EE13.7080702@redhat.com> <alpine.LFD.2.00.1004110844420.3576@i5.linux-foundation.org> <4BC1F31E.2050009@redhat.com> <20100412074557.GA18485@elte.hu> <20100412081431.GT5683@laptop> <20100412082218.GA7380@elte.hu> <20100412083420.GV5683@laptop>
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To: Nick Piggin <npiggin@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@linux-foundation.org>, Jason Garrett-Glaser <darkshikari@gmail.com>, Mike Galbraith <efault@gmx.de>, Andrea Arcangeli <aarcange@redhat.com>, Pekka Enberg <penberg@cs.helsinki.fi>, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>, Izik Eidus <ieidus@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, Dave Hansen <dave@linux.vnet.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Mike Travis <travis@sgi.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Christoph Lameter <cl@linux-foundation.org>, Chris Wright <chrisw@sous-sol.org>, bpicco@redhat.com, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Balbir Singh <balbir@linux.vnet.ibm.com>, Arnd Bergmann <arnd@arndb.de>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Johannes Weiner <hannes@cmpxchg.org>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>, Arjan van de Ven <arjan@infradead.org>
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On 04/12/2010 11:34 AM, Nick Piggin wrote:
> The interesting fact is also that such type of thing is also much more
> suitable for doing optimisation tricks. JVMs and RDBMS typically can
> make use of hugepages already, for example.
>    

That just shows they're important enough for people to care.  What 
transparent hugepages does is remove the tradeoff between performance 
and flexibility that people have to make now, and also allow 
opportunistic speedup on apps that don't have a userbase large enough to 
care.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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